Merry Christmas! Keeping up-to-date with the geometric adventures of my friend, Einar Thorsteinn, who lives in Berlin, this is his latest creation: a configuration he defined in 1978 but has just now built. He gave me an explanation about expanding on the transformation in geometry Buckminster Fuller called "Jitterbug" (sometimes when Einar tries to explain things to me it makes my brain hurt), but I just think it’s beautiful—as did Olafur Eliasson, who will be showing a work based on it at a Madrid gallery in January.